SURFACE-MOUNT FUSES
Slow-Blow Chip Fuses
Available in industry standard 1206 and 0603 chip sizes,
Littelfuse slow-blow chip fuses help provide overcurrent
protection on systems that experience large and frequent
current surges as part of their normal operation.
The slow-blow chip fuse’s monolithic, multilayer design
helps provide some of the highest current ratings
available in the 1206 and 0603 footprints and enhances
high-temperature performance in a wide range of
circuit protection designs. The devices’ small size, high
reliability and strong arc suppression characteristics
make them suitable for overcurrent protection of power
supplies, capacitor filter banks, Liquid Crystal Display
(LCD) backlight inverters, electric motors and portable
electronics.
BENEFITS
APPLICATIONS
• Time-delayed design prevents nuisance openings in
pulsed and high inrush current applications
• Small motors systems
• Small size with high-current ratings
• Input power ports
• Strong arc suppression characteristics
• Power over Ethernet (PoE)
• Portable electronics
• Test equipment
FEATURES
• POL converter protection
• Lead-free materials and RoHS compliant
• Computer drives
• Halogen free
(refers to: Br900ppm, Cl900ppm, Br+Cl1500ppm)
• Displays
• Printers
• Monolithic multilayer design
• High-temperature performance
• -55°C to +125°C operating temperature range
RoHS Compliant, ELV Compliant
HF Halogen Free
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
107
Surface Mount Fuses
Slow-Blow
Chip Fuses
Shape and
Dimensions
in (mm)
0.063±0.008
(1.60±0.20)
0.126±0.008
(3.20±0.20)
Table FS1 — Clear Time Characteristics
0603SFS Series
1206SFS Series
0.038±0.008
Clear Time(0.97±0.20)
at 25°C
% of Rated Current
100%
4 hrs (min)
200%
800% (1.0A-1.5A)
Recommended
Pad
Layout
800%
(2.0A-5.0A)
in (mm)
Clear Time at 25°C
100%
4 hrs (min)
1 s (min)
120 s (max)
200%
1 s (min)
120 s (max)
(min)
3 s (max)
300%
0.1 s (min)
3 s (max)
0.0005 s (min)
0.05 s (max)
800% (1.0A-1.5A)
0.0016 s (min)
0.05 s (max)
0.001 s (min)
0.05 s (max)
800% (2.0A-8.0A)
0.002 s (min)
0.05 s (max)
0.020±0.010
(0.51±0.25)
0.1 s
300%
% of Rated Current
—
0.173
(4.40)
0.059
(1.50)
—
0.071
(1.80)
Table FS2 — Typical Electrical Characteristics, Dimensions and Recommended
Pad Layout
0.057
(1.45)
0603 (1608 mm) Slow-Blow Chip Fuses
Shape and
Dimensions
in (mm)
0.031±0.006
(0.80±0.15)
Typical
Electrical Characteristics
0.063±0.006
(1.60±0.15)
Part Number
Current
(A)
1.0
0.200
0.093
32
50
1.5
0.100
0.18
32
50
0603SFS200F/32
2.0
0.052
0.32
32
50
0603SFS250F/32
2.5
0.041
0.63
32
50
0.110
(2.80)
0603SFS300F/32
3.0
0.031
0.87
32
50
0.024
(0.60)
0603SFS350F/32
3.5
0.021
1.20
32
50
0603SFS400F/32
4.0
0.017
2.30
32
50
0603SFS450F/32
4.5
0.015
2.70
32
50
0603SFS500F/32
5.0
0.013
3.20
32
50
0.039
(1.00)
0.043
(1.09)
1206 (3216 mm) Slow-Blow Chip Fuses
0.063±0.008
(1.60±0.20)
Typical
Electrical Characteristics
0.126±0.008
(3.20±0.20)
Part Number
Rated
Current
(A)
Nominal Nominal
Cold DCR
I 2t
(Ω)*
(A2sec)†
Max
Interrupt Ratings
Voltage
(VDC)
Current
(A)
1206SFS100F/63
1.0
0.360
0.11
63
50
1206SFS125F/63
1.25
0.200
0.22
63
50
1206SFS150F/63
1.5
0.150
0.23
63
50
1206SFS200F/63
2.0
0.088
0.63
63
50
1206SFS250F/32
2.5
0.065
0.90
32
50
1206SFS300F/32
3.0
0.034
1.20
32
50
1206SFS350F/32
3.5
0.028
1.60
32
50
0.173
(4.40)
1206SFS400F/32
4.0
0.024
2.20
32
50
0.059
(1.50)
1206SFS450F/32
4.5
0.020
3.60
32
50
1206SFS500F/32
5.0
0.016
5.30
32
50
1206SFS550F/24
5.5
0.014
6.40
24
50
1206SFS600F/24
6.0
0.011
8.50
24
60
1206SFS700F/24
7.0
0.010
10.00
24
60
1206SFS800F/24
8.0
0.009
16.90
24
60
0.038±0.008
(0.97±0.20)
0.020±0.010
(0.51±0.25)
Recommended
Pad Layout
in (mm)
Voltage
(VDC)
0603SFS150F/32
0.014±0.006
(0.36±0.15)
Shape and
Dimensions
in (mm)
Nominal Nominal
Cold DCR
I 2t
(Ω)*
(A2sec)†
0603SFS100F/32
0.031±0.006
(0.80±0.15)
Recommended
Pad Layout
in (mm)
Rated
Current
(A)
Max
Interrupt Ratings
0.071
(1.80)
0.057
(1.45)
* Measured at ≤10% of rated current and 25°C ambient temperature.
† Melting I2t at 0.001 sec clear time.
Shape and
Dimensions
in (mm)
0.031±0.006
(0.80±0.15)
0.063±0.006
(1.60±0.15)
0.031±0.006
(0.80±0.15)
108
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
0.014±0.006
(0.36±0.15)
HF Halogen Free
RoHS Compliant, ELV Compliant
Surface Mount Fuses
Slow-Blow Chip Fuses
Figures FS1-FS4 — Family Performance Curves
Figure FS1
A
2. 5
3.0A
A
3.5
A
4.0
A
4.5
A
5.0
A
2. 0
1.5
A
1.0
A
0603SFS Average Time Current Curves
100
Clear Time (s)
10
1
0.1
0.01
0.001
1
10
100
Current (A)
Figure FS2
0603SFS I²t vs. t Curves
0603SFS Family I2T vs. Clear Time
10,000
10,000
5.0A
4.5A
5.0A
4.0A
4.5A
3.5A
4.0A
3.0A
3.5A
2.5A
3.0A
2.0A
2.5A
2.0A
1.5A
1000
1000
1.5A
1.0A
1.0A
I2t (A
I2t2Sec)
(A2s)
100
100
10
10
1
1
0.1
0.1
0.01
0.010.001
0.00001
0.0001
0.01
0.001
0.1
0.01
Time (s)
Time (Sec)
0.1
1
1
10
10
100
100
Note: Curves are nominal.
RoHS Compliant, ELV Compliant
HF Halogen Free
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
109
Surface Mount Fuses
Slow-Blow Chip Fuses
Figures FS1-FS4 — Family Performance Curves
(Cont’d)
Figure FS3
A
A
3.0
3 . 5A
4.0A
4.5A
5.0 A
5 . 5A
6 .0 A
7.0 A
A
8 .0
A
2. 5
2. 0
1. 2
5A
1.5
A
1.0
A
1206SFS Average Time Current Curves
100
10
Clear Time (s)
1
0.1
0.01
0.001
1
10
1000
100
Current (A)
Figure FS4
1206SFS I²t vs. t Curves
100000
8.0A
7.0A
6.0A
5.5A
5.0A
4.5A
4.0A
3.5A
3.0A
2.5A
2.0A
1.5A
1.25A
1.0A
10000
1000
I2t (A2s)
100
10
1
0.1
0.01
0.001
0.01
0.1
1
10
100
Time (s)
Note: Curves are nominal.
110
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
HF Halogen Free
RoHS Compliant, ELV Compliant
Surface Mount Fuses
Slow-Blow Chip Fuses
Notice:
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining
or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may
result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall
be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising
out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject
to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse.
RoHS Compliant, ELV Compliant
HF Halogen Free
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
111
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